Experiment § Soft glue that cures in five minutes
Everyone's impression of epoxy resin is that the resin has poor toughness and high hardness. With the rapid development of materials, there are already many ways to solve these shortcomings. For example, adding plasticizer, liquid rubber, PU grafting, etc., can make epoxy resin softer and more elastic. However, these methods will slow down the reaction speed of the epoxy resin and cause difficulties in the development of soft resins. For a five-minute curing adhesive, it is often fixed in a short time with a compact process, but the reaction rate cannot be improved, so the two properties cannot be possessed at the same time. Recently, Everwide Chemical has broken through difficulties and developed JC482-2 two-component soft glue that cures within five minutes. It has the advantages of fast response, low hardness, repeated flexibility, low stress, low halogen, and light color. There are not many related products at the same level, and there is a new choice for the engineers of materials evaluation.
─Author: R&D Assistant Engineer Ms. Jia-Ying, Qiu Ms. Shu-Ting, Yang Everwide Chemical
Activity § Joining of new employees
Last year, Everwide Chemical recruited three batches of R&D training assistants. After the first training period, if they pass the exam, they will be distributed to various laboratories for the second phase of the internship. The internship lasts for ten months. In addition to studying R&D matters, they are led by assistants in various laboratories to conduct various experiments, and they must also be familiar with the characteristics of raw materials and product development. After the end of the second phase of the internship, there will be an evaluation meeting to carefully evaluate whether each intern assistant is eligible to become a full-time R&D assistant. Up to now, four training assistants have successfully entered each laboratory and become full-time R&D assistant engineers. We look forward to the R&D team of Everwide Chemical that can gather all forces to form a stronger R&D team. Upholding the concept of R&D and innovation, we hope to provide each customer with the latest and strongest new products that are different from the past and hope to grow together with customers and create a better future.
※ The description of the photos, from left to right: Ms. Li-Ling, Liu Mrs. Kun-Lin, Cai Ms. Zhen-Ru, Liao Mrs. Zhi-Yu, Huang
Knowledge § What is the induction time of epoxy resin?
Epoxy resins are fully compatible with most curing agents, but there is a problem with the compatibility of some curing agents with epoxy resins, especially polyamides (Amidoamines) curing agents formed by condensation of fatty acids and polyamines. Because this type of curing agent has a large difference between the structure of long-chain fatty acids (The dibasic fatty acid used by Polyamides is C36, and the mono fatty acid used by Amidoamines is C18) and the aromatic structure of epoxy resin, the initial stage after the two is mixed shows a milky white, foggy, and poorly compatible appearance. If the above mixture is processed and applied at this stage, this type of curing agent may float to the surface of the object before the resin is cured, causing oily surface and even poor curing. If the above mixture is allowed to stand for a period of time before processing and application, the situation will be much improved. This period of resting time is called induction time. During this period of time, the resin and part of the curing agent react and the products produced will greatly help the compatibility of the system and improve the compatibility between the two. Generally speaking, the faster the reaction rate of the system, the shorter the induction time, and the heating reaction can also shorten the induction time.
Living § Where is the air? (1)
Today, I will lead the kids in the science experiment camp to make cakes. During the baking process, the cakes will expand and fill with air. So, where is the air? Can you see and touch it? Ask the children to take a deep breath and exhale again, and the small air molecules are in the nostrils and mouth. The oxygen in the air is the gas that humans rely on for life. Without oxygen, we cannot breathe and cannot survive. Oxygen entering the lungs will be converted into carbon dioxide and then vomited out. The air contains oxygen and carbon dioxide, and we have easily learned both. Have the kids ever eaten biscuits packaged in a space bag? Do you feel that the packaging bag is a little bulging before you unpack it? What kind of gas is there? Some children raised their hands and said it was oxygen, but that was a big mistake. Oxygen can easily oxidize things and cause deterioration. In fact, the packaging bag is filled with nitrogen. Nitrogen will not oxidize the food and prevent the biscuits from being crushed. Therefore, manufacturers will inject nitrogen to maintain the freshness and integrity of the biscuits.
─Author: Ms. Miao-Ling, Lin R&D Engineer, Everwide Chemical
